Surf Gear manufactures beach towels. The plant has a production capacity of 48,000 towel each month. Currently, the expected results of August are as follows: Per unit Total Units Sold Revenues Cost of goods sold 30,000 $20 $600,000 Variable manufacturing Fixed manufacturing Total cost of goods sold Variable marketing costs 7.5 $225,000 4.5 $135,000 12 $360,000 costs costs Marketing costs 5 $150,000 2$60,000 7 $210,000 19 $570,000 1$30,000 Fixed marketing costs Total marketing costs Total cost of the product Operating income Azelia hotel has offered to buy 5.000 towels from Surf Gear in August at$13 per towel. This special offer will not affect current sales expected irn August and marketing costs if Surf Gear accept this special offer, how much is increase in operating income